Update README.md

README.md

@@ -71,8 +71,8 @@ print(lengths[:5])
 </ul>
 
 
-<h2>Citation</h2>
-<ul>
+### Citation
+```
 @article{Schmidt2010,
   title = {Correlation of 2J couplings with protein secondary structure},
   volume = {78},
@@ -87,6 +87,6 @@ print(lengths[:5])
   month = feb,
   pages = {1544–1562}
 }
-</ul>
+```
 
 <i>_This dataset was curated by Nicolas Langdon (<a href="mailto:nblangdon@wesleyan.edu">nblangdon@wesleyan.edu</a>) from the five original papers listed above._</i>